How to Sign Up for Medicare Part A & B

How to Enroll in Medicare

Navigating the transition to Medicare is a major financial and healthcare milestone. The Social Security Administration (SSA) is the federal body responsible for actively processing enrollment applications for Original Medicare (Part A and B) and meticulously overseeing your premiums and potential penalties.

If you are not already receiving Social Security benefits before you turn 65—and therefore are not automatically enrolled in Medicare—you must take the initiative to apply for Part A and B coverage yourself. The most straightforward way is through the official Social Security Administration website: https://www.ssa.gov/medicare/sign-up.

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Automatic Medicare Enrollment Eligibility

Depending on your unique financial and medical situation, you may actually be automatically enrolled in Medicare without lifting a finger:

• If you are turning 65 and have been receiving Social Security payments for at least 4 months before becoming eligible for Medicare: In this case, the system works in your favor. You will automatically get Parts A and B starting the first day of the month you turn 65. Note: If your birthday lands exactly on the first day of the month, your coverage will favorably kick in on the first day of the prior month. You will typically receive your official red, white, and blue Medicare card in the mail roughly 3 months before your 65th birthday.
• If you are turning 65 but are NOT receiving Social Security: You must take immediate, proactive steps. You must directly contact the Social Security Administration to sign up for Medicare during your Initial Enrollment Period. This crucial rule applies to anyone who has not received Social Security for at least four months prior to becoming eligible for Medicare.
• If you are under 65 and living with a qualifying disability: You will be automatically enrolled in Parts A and B after receiving disability benefits from Social Security Disability Income for 24 continuous months (unless you have ESRD or ALS). Thankfully, Medicare coverage for highly vulnerable individuals with ESRD or ALS may begin much sooner.
• If you live in Puerto Rico or outside the U.S.: Beneficiaries living in Puerto Rico are automatically enrolled in Part A, but they must proactively enroll in Part B to avoid massive coverage gaps—even if they meet automatic enrollment criteria used in other regions. For citizens living outside the U.S., automatic enrollment is generally suspended unless they receive Social Security or Railroad Retirement Board benefits and meet other strict criteria.

What Happens If You Don’t Sign Up for Part B When Automatically Enrolled in Part A?

Missing your enrollment window is a costly mistake. If you’re automatically enrolled in Part A but neglect to deliberately sign up for Part B, you may face several compounding financial and medical challenges:

• Permanent Late Enrollment Penalties: Waiting too long to enroll in Part B can result in a punishing financial penalty that lasts for the rest of your life. You’ll be forced to pay an extra 10% on your premium for every full 12-month period you were eligible but failed to sign up.
• Dangerous Coverage Gaps: Without Part B, you are entirely responsible for important, high-cost outpatient services. Routine doctor visits, vital preventive care, and necessary medical equipment simply won’t be covered.
• Strictly Limited Enrollment Opportunities: If you casually miss your Initial Enrollment Period, you are locked out until the General Enrollment Period (January 1 to March 31), and your desperately needed coverage won't even start until July 1.

Medicare Enrollment for Disability Beneficiaries

Individuals under 65 who receive disability benefits face their own set of rules, though they are typically enrolled in Medicare automatically. Here are the key details you need to know:

• Timing: Medicare coverage begins automatically only after a grueling 24 months of receiving Social Security Disability Income (SSDI). However, for those battling ALS, coverage begins the very first month SSDI benefits start. For individuals managing ESRD, coverage timing depends on highly specific treatment milestones.
• Notification: You will securely receive your official Medicare card in the mail approximately three months before your hard-won coverage begins.

How to Apply for Medicare Part A and B

If you fall outside the criteria for automatic enrollment, you must proactively apply for Medicare Part A and B using one of the following official methods:

• Online: Visit the secure SSA website (ssa.gov/medicare/sign-up) for a convenient, relatively straightforward application process from the comfort of your home.
• Phone: Call the SSA directly at 1-800-772-1213 (TTY: 1-800-325-0778). Trained representatives can carefully guide you through the process and answer your specific questions.
• In-Person: Visit your local Social Security office to speak with someone face-to-face. You can easily find the nearest location using the SSA Office Locator tool.

Step-by-Step Guide to Applying Online

1. Gather your required information beforehand to avoid being timed out, including:
   • Your Social Security number.
   • Your original birth certificate or accepted proof of birth.
   • Your employment details, if applicable.
   • Information about any current health insurance coverage you carry.
   • Securely visit ssa.gov/medicare/sign-up.
   • Follow the on-screen prompts to create a new account or securely log in to your existing one.
   • Carefully complete the digital application form and submit it for processing.